Asteroids with Satellites Database--Johnston's Archive
(109013)
2001 QS4
compiled by Wm. Robert Johnston
last updated
19 June 2025
--Orbital and physical data--
(See this page for definitions of quantities; source codes in brackets, see this link for full references; *A, *D, and *E indicate assumed, derived, and estimated values, respectively.)
dynamical type, primary:
main belt asteroid
orbital data, primary (osculating elements)
[JPL]
: |
semimajor axis a: |
2.8970988989 AU
| |
orbital period P: |
4.931206436 yr
(= 1801.1231507 d)
| |
eccentricity e: |
0.1608989382
| |
perihelion distance q: |
2.430958762 AU
| |
aphelion distance Q: |
3.3632390355 AU
| |
inclination i: |
12.25957287°
| |
argument of perihelion ω: |
276.258415°
| |
ascending node Ω: |
314.47505065°
| |
mean anomaly M: |
5.3220413°
| |
perihelion passage TP: |
2025 Apr 08.373190
| |
Epoch: |
2025 May 05
| |
data arc: |
1991-2024
(1161 obs.)
| |
Earth MOID: |
1.45853 AU
| |
Jupiter Tisserand invariant TJ: |
3.235
|
orbital data, secondary:
|
semimajor axis as: |
14.8
km
(separation)
[N25c]
| |
separation/primary radius as/rp: | 6.2 [*E] | |
separation/Hill radius as/rH: | 0.014 [*E] | |
orbital period Ps: |
1.3
d [*E]
| |
eccentricity es: |
?
| |
normalized ang. mom. αL: |
?
|
|
other data, system (combined):
|
absolute mag. H: |
15.07
[MPC]
| |
slope parameter G: |
(0.15) [*A]
| |
effective diameter dE: |
6.96
± 0.06
km [M19a]
| |
geometric albedo: |
0.036
± 0.007
[M19a]
| |
color index U-B: |
?
| |
color index B-V: |
?
| |
taxonomic type: |
?
| |
mass m: |
?
| |
density ρ: |
(1.6
g/cm3) [*A]
| |
Hill radius rH: |
1100 km [*E]
|
other data, primary:
|
diameter dp: |
4.8
± 0.3
km [N25c]
| |
rotation period RPp: |
?
| |
amplitude in mag., rotational ΔM: |
?
| |
pole direction Β, λ: |
?
,
?
|
other data, secondary:
|
diameter ds: |
4.0
± 0.3
km [N25c]
| |
diameter ratio ds/dp: |
0.83
[*D]
| |
component mag. difference ΔM: |
0.40
[*D]
| |
rotation period RPs: |
?
| |
|
|
--
(109013) 2001 QS4
--discovery and notes:
Primary discovered
2001 Aug 16
from
Socorro, New Mexico, USA
by
LINEAR Program.
Alternate designation(s):
1991 PX22.
Linked to prediscovery observations from 1991 Aug 02.
Permanent number assigned 2005 Oct 19.
Companion discovered
2025 Jun 01
by P. Nosworthy, D. Herald, and D. Gault
using
stellar occultation
observations from Blue Mountains, New South Wales, Australia.
Announced
2025 Jun 17 [N25c].
--Links, more technical:
--Links, less technical:
--Links to ADS abstracts:
©
2025
by Wm. Robert Johnston.
Last modified
19 June 2025.
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